Cov yeeb yaj kiab yog tsim los ntawm casting txheej txheem thiab polyethylene raw khoom siv tau cov txheej txheem casting, siv cov khoom tshwj xeeb los ntawm cov duab sib txawv .Yog rau cov khoom sib xyaw ua ke ntawm cov pa, qhov no Hom yeeb yaj kiab tseem muaj qhov txawv txav cuam tshuam zoo.